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Pico i.MX7Dual: I2S  -> can not open pcm_out driver

Question asked by on May 14, 2019
Latest reply on May 14, 2019 by CarlosCasillas

Good Day iMX community.


This question is regarding Android of Things.


I'm a little desperate. I2S seems not to work on Pico i.MX7Dual.


If I try to play a sound with audioTrack. In the raspberry pi 3 it works without problems, but if I execute it in imx7d it gives me the following error:

  • audio_hw_primary: card 0, port 0 device 0x1000000

  • audio_hw_primary: rate 48000, channel 2 period_size 0xc0

  • audio_hw_primary: can not open pcm_out driver 0: can not set hw params: Invalid argument

The same thing happens with an i2s microphone

This is the code:


final AudioDeviceInfo audioOuputDevice = findAudioDevice(AudioManager.GET_DEVICES_OUTPUTS, AudioDeviceInfo.TYPE_BUS);


    int mBufferSize = AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);


        AudioFormat audioOutputFormat = new AudioFormat.Builder()


        audioTrack = new AudioTrack.Builder()
                .setBufferSizeInBytes(mBufferSize * 2)




It is not about pins connections (J9: 3,6,10,7), It doesn't matter, connected or unconnected. Same Result


I changed the wav format. Same result too.


Thank you very much!